Bridging-block for dynamo-electric machines.



F. W. YOUNG.

BRIDGING BLOC-K FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED JUL IE 2, 1909. 941 l 89 Patented N0v.28,1909.

' Wiiness es;

lnventgr, Frederick WmYZun iwcessary to provide means BRIDGING--BZLOCK FOB DYNA. iO EliEGltltifl Specification of Letters Patent.

JERSEY, A CORPDRATISN OF NEiV JERSEY.

ASSIGNGR T0 CROCKER- MACHINES.

li atcnted Rev. 212, race.

application filed. June 2, 1909. Serial No. 439,696.

To all whom it may concern:

lie it known that l, l nanaaicrr VVYILLIAM YUL'NU, a citizen. of the United States of America, and a resident of East Orange, county oi" Essex, and State of New Jersey, have invented ce tain ncwnnd useful 1mprovenients in lh'i ging-iiloclrs for Dynamolllectric ivlachines, of which the following is a specification.

in the provisionoi dynamo-elcctric machine elements, with bridging-blocks, the purpose o'l which is to close the slots of the clement, and hold the windings therein, the labor of assembling is much reduced by making the blocks of considerable length, since then there will be fewer to handle. Owing to the lack of uniformity in the slots, and be cause it is nccessary'to interpose insulation, such as paper, which is easily abraded, between the blocks and the engaging sides of the slots, and also provide insulation between the blocks and the windings, l have found it for facilitating the assembling and for reducing the danger of 'such abrasion.

The object of thisinvention is to provide such means and reduce such danger and at the same time tribute to the netic functions of the blocks.

1n the accompanying sheet of drawings which forms a part of this application Figure 1 is a perspective of a portion of a dynamo-electric machine element, with windings and bridgingblocks constructed in accordance with my invention. Fi 2 is a perspective of a bridging-block. *ig. 3 is a perspective of one of the bridging-blocks shown in Fig. 1. Fig. lis a perspective of a bridging-block embodying other features. Fig. 5 is a perspective of a simplified form of bridgingblock.

The invention is illustrated in connection with a laminated toothed armature A, constituting the dynamo-electric machine element with slots containing windings or coils W. The walls of the slots near their mouths and above the windings are inclined, forming dovetail sha'ped channels, and into the channels thereby formed, are preferably inserted troughs of paper P to receive and retain slotclosing bridgingblocks B the blocks may be coated with a-hard japan or enamel. These blocks are of magnetic maprovide means which will conuseful, mechanical and magbut in lieu thereof elongated terial, as rolled st eel, preferably with high resistivity, but they may be oi cast iron particularly in the for in of malleable iron. It is economical to make them oi considerable length, so that few and will he required their ends, and par block which is on or will have to be handled to till the channels. At

ticularly at the end of each tered in assembling, is a groove g whicn opens out to the end, so that the end of the block will be forked, and the and thereby avoid cutting or tearing the pa per trough.

Other grooves g y are provided along the middle line of the block and in line with the grt between the forks.

In the form shown in Fig. 3 there )OVG, or grooves at the ends are two additional lines of grooves g on either side of the middle line of grooves, and staggered in position with respect to the grooves along the middle line. are of advantage in increasing the magnetic lQSIStaIICQ/ZICIOSS the blocks,

All of these grooves and they thereby prevent the shunting of magnetisigr above the windings, such magnetism being ineffective for induction of current in the windings.

In the tor-m shown in Figs. 2 and at, the

sides of the block a re slightly spread op posit each of the grooves along the middle line so that when the block is forced into place in its channel, these spread portions Wlll yield to any slight irregularities in at the same time,

them more secure.

lVhat I claim by Letters Patent 1. The combina tric machine slots, of windings elongated of which is provid stantially as descr 2. The combination slot-closing the slot walls, and, exert a tension makmg as new, and desire to secure of the United States, istion with a dynamo-elecelement having coil-containing located in the slots, and bridging-blocks, each ed ibed.

with a dynamo-electric machine element having coil-containing slots, of windings located in the slots, and

slot-closing bridgingblocks, each of which is provided with a series of longitudinal grooves, one of the grooves extend ing to the end of forked end, substa 3. As an article gated slot-closing the block and forming a ntially as described.

of manufacture, an elonh-ridgingblock provided with a forked end, subwith a forked end, substantially es described,

4. As an article of manufacture, an elongated slot-closing bridging-block provided with 5: series of longituolinal grooves, one 01 the grooves extending to the encl oi. the block and forming a forked end, substantially deseribeds.

5. As an article of manufacture, an elon gated siotelosiiig bridging-block provided with a series of ongitudinal grooves, the sides of the block being spread opposite each groove, substantially as described.

6. As an article of manufacture, en elongated slot-closing bridging-block provided with a plurality of series of longitudinal grooves, the grooves in one series being in staggered position with respect to the grooves in the adjoining series, substantially as described.

'7. As an article of manufacture, an elongated slot-closing bridging-block provided With a'plurality of series of longitudinal grooves, the grooves in one series being in staggered position With respect to the grooves in the adjoining series, one of the grooves extending to the end of the block and forming a forked end, substantially as described.

Signed at East Grange, New Jersey, the 29th day of May, 1909.

FREDERICK WlLLlAl'vi YOUNG. Witnesses A. C. BUNKER, C. ll. WHEELER. 

